Machine tool and the like



Sept. 12, .1944.

W. WEMHONER MACHINE TOOLS AND THE LIKE 1 Filed Nov. 30, 1940 IIIIIII/IIIIIIIVIIIIIII/A chine tools.

Patented Sept. 12, 1944 23513369 7 v MACHINE moon AND! mnn'mirn Wilhelm 'Wenihiiner, "'BerlinKar ls'horst; 1 Ger many; vestedin thewklien' Pmperty -'.Cns'todian In Germany ilkcemher 55, 51939 i U "'9 Claims; r01. silo-e My invention relates to improvements in .rna-

chine tools and the like; and more particularly in operating mechanisms provided in suehcma- The object of the improvements is to iprovidetime controlled means in connection withthe said operating mechanisms ior ,preventing excessive pressure to be built .up whichmight destroy either blanlnv i.

My inventionvmaybe :used for example in. screw-threading machines of the'type described theooperating mechanism or the in the :copending application for patent of ..Pla gemannand wemhoner, Patent No. 225752.53 issued Seritemben-BO, 1941, the time controlled means being used in connection with the supply "of oil under pressure to the cylinders for :ad- 'vancing the roller idies towards each other. In the following I shall describe the invention with reference to-the .sai'd screwethreading machine. But I wish it :to be understood that my invention is not limited-to :such use, and *that it maybe;

embodied in other machine tools. 7 i

for patent, externally screwethreaded roller dies are provided :tor sinking .screwQtihreads fin -a blank pla ced. between the. same, the said roller rdi'es -being. rotatedgin the-same direction and-i being 'ad-, vanced towards each other while yelling :ta'kes place for sinking the thread into-the blank. the said; machine means are provided for interrupting the feed of the roller ,dies towards each 50f a .part oi the pressure advancing :blanks, which may fihave ithe enact size or which :may be too thick or too small in diameter, are placed on the machi e, and The machine is opera'ted exactly the time previously ascertained by working :a .blank of normal size.

ositions. If, owever, theJ-blank is: too think. the it'eed of the roller die -or dies-is interrupted by thetime controlled means :and heforezthe roller :dies have arrived in itheiripredetermined-end p0 however, the blank is 'too. small diameter; the ieed is interrupted in the iSitiQIl or positions.

end posit'ion f0 the die or dies and before the thread has been finished. Thus, Emy improved 31193115331150 enable me to distinguish screws :of

abnormal size fr0m scr;ews :n'f normal size which 7 :are :suitahle =for ,sale.

the preferred embodiment the :=inventioni the time controlled means depend on the iflow R5 roller die :'or dies through an @rificeof :a definite ther when the threadshavefibeen :suri-k to the! s -de th 1:; 1 e v v The blanks- ,to be. screw-threaded in the said machine arejfirstreduced on a suitable-machine to .a definite diameter. so that after sinking ft'he screw-threads into the same :a screw or the 1218- sired diameter .is obtained, If the diameter of theijhlanki-to be threaded on the machine is too large, the screw-thread is "1 m bed before the roller dies have been vadvancec'l ito the ;end of their i strokes, and if rolling and jteeding of the dies ii-s 'continued excessive :pressureiis built up, whereby the blank :or parts oi the machine, and particle.

larly the expensive roller ndies .m'ayheinj-ured In my i mproved machine .fieeding movement -=of the :ro'llerdie or dies continued zenly until "the screw-thread has been finished, whereupon the feeding movement is automatically interrupted, and for this purpose the .said time 2001]- V trolled interruptingjmeans are provided. In the operation of "the machine a blank of normal :size

is first-placed. on thermachine, and "the time needed for sin-king the screw-thread into the sameis ascertained, and thereafter-the rfiollnwing area. in the -embodiment of invention ile- :serihed .herinzthe nun supply connected Ha -conduit including a throttle valve through which the said partof the liquid is forced into a portion of the conduit connected with a piston c :adapted'to be shifted by the fluid flowing through the said orifice and *to interrupt the supply or] the roller adie feeding 1rnechapressure fluid, to

For "the purpose 20f explaining the invention an example embodying thesame has been illustrated in fzth'e accompanying drawing, "the said drawing showing the 'deviceiin :a flflagrammaticail way and partly :se'ction. I f the said drawing certain parts :oi the machine illustrated in the said application ior natent have been illustrated and corresponding have, received the :same "reference riharacters F35 I Bin-the sa'id application. The said partsarera "bed 1 on which the operative ipauts are mounted.

two roller dies 2 and 3, :a" be'a1' ing '23 fixed to the hedand having the roller die irotatahlv "mounted thereon, a -slide lil on which the roller :die 2 is mounted, :a cylinder fixed to the hen and having :a piston 39 mounted therein, the said piston .-enga ging the slide All for urging the same 1 "with sits rdll'er die 22 "towards the vroller :die 3 and fheing :acted' upon a spring 733 tending to tretract: the same from the roller die 3, QjPI-ESSHITE suptily 1'3 connected with ithe saiifl cylinder and n how the v f blankgtoheworked hasrtheexactrdiameter-ofzthe normdl blankpt'he work automatically inter; v rupted either by myjmproved time controlle'd means or "bymeans which are made operative when the rollerjdies have arrived "in their end V maliy grounded, and the=contact 88 isinsu1ate'dfromthe lever TI and connected by a lead 89 with the electromagnet l0. 1

The cylinder 31 is connected by a pipe with a conduit a divided by a partition vinto two. champroviding an orifice. .As shown, the branch con duit comprises a cylindrical. body g fixed to"the 9 rested by the needle it. During thlsoperation the pressure within the chambers b and b i small,

because the resistance opposed to the piston 38 is small. Now the roller dies 2 and 3 are rotated, and'the supply of pressure fluid to the cylinder 31 is continued. By the increased resistance opposed to the roller dies during rolling the pressure within chambers b and b rises, the said pressure being indicated on the gauges ,f and-n. The flow of-liquidwithin the chambers b 'and b is controlled by the orifice between the ball 1 and the bore-h. By the supply of liquid to the chamber h h b and the increasing pressure thereof the piston bers b and b. The said chambers are provided' .o is gradually shifted upwardly in opposition to P the pressure of the. spring 9. When the thread 7 has been sunk in the blank, the screw r is screwed tapering bore h forming the said orifice. Within the said bore it there is a spherical plug or ball 1' inwardly so far that the contacts q and s engage each other. Thus the'electromagnet I0 is energized and thethree-way valve 65 is closed as against the pipe 43 and opened to the outer air so that the piston 39 is forced to the right by'the normally resting on a pin'w and adapted to'be forced upwardly by the flow of the liquid rising within the bore h; The upper part of the body 9 is internally screw-threaded,-and it contains a screw-threaded stem 7' which is adapted to be screwed inwardly or outwardly by means of a knob a". Thebottom end of'the stem? is in the form of a needle -k adapted to limit the upward movement of the spherical valve. body 1' in ac-fl cordance' withthe position of the stem'a'. I

The right hand: chamber b communicates with the upper part of the bore-of the body gthrough I a pipe I. To the right hand part of theconduit'a providin theflcha'rn ber bfa cylinder m is fixed in which a piston o ismo'unted, a spring p urging thepiston o downwardly. At its upper end the rod of the piston 0 is in: the formof aj switch contact q which is electrically connected with-the cylinder m and with the ground. In an insulating which is provided with a switch contact is and which is adapted to be screwed inwardly and out dl bym ians of a knob'r'f I The chamber b provided'with' a vent t nor-" closed by a valve for removing air from the The insulated screw'r and contact s are con nected by a lead Kwith a source of electric energy which as shown comprises .a transformer the "40 stufling box a: of the cylinder-m a screw r is guided primary 1? of which isconnected with a source of alternating fcurrent'Y, and the secondary: S of which isconnected'toa rectifier G, the said rec'- tifier transforming the alternating current into between '-'q, s is closed,'thus indicating that the screwh'as the i'oller'dies 2 and 3, the needle 76 is set so as' to holdthe ball i in a po'sitionj'to providea suitable annular orifice between the same and the tapering wall 7; Folitll present the balli rests on the piniwfi Pr'essurefluid is supplied to the cylinder" 81 "through the, pipe, the said pressure fluid a forcing the piston 39' and the slide 4| to the left and with the'rollef diefinto contact with the 1 tion beyond a predetermined point;

blank. A portion of the pressure liquid flows through the pipe 0 into the chambers b and b of. v

the cylindrical body a, and it completely fills the said parts as'has been indicated in the figure;

on its seat, and it inder m; l

The extent oi-the upward movement of the piston 0 indicates the time needed for 'sinking a screw-thread in the blank, and it dependson the ,1 area oftheorifice provided bythebore-h and the Should the'extent of the upward move-s" client of the piston ofland the contact q not be suitableffor aproper operation of the device, the orifice between theballi and the bore htis varie'd by screwing thestem i inwardly or outwardly. After the parts hav thus been'sett-into-the proper positions,- the regular work'beginsby-placing ablankbetween the-rolleridie 2 and 3. The pressure liquid is supplied'to the cylinder 31' for movingthe roller.- die 2 .into .contactwiththey blank. During this movement no pressureliquid; flows into the chamber bflbecause the pressure-:15: within the cylinder 31' is not sufllcient to lift the piston 0. When rolling begins-the pressure rises;--

ball i.

within the cylinder 81 .and the chambers!) and b1,

' and therefore the :piston" o is slowly --moved up i *wardly; while the screw-thread is being. sunk in i the blank. Finally the contact q gets .into men-1 gagementwith the contact s,indicatingithat'the-.

' screw-thread is finished.- The electromagnet is energized and-the'valve 65 isclosed. i

'If the blank was too thickin' diametenthe' switch q, sis-closed before the contacts8rand' 88 of 'the' lev'er ll-lan'd the arm' 83 'enga'ge'each other, and if the blank was too small in diameter,

the contacts {IT and 88 engage, before the switch not the regular size.

I claim:

1. In operating mechanism for cutti'ng 'machines, the combination of means for advancing a tool toward a blank and into deforming engagement therewith, said means"continiiing to advance the tool into'the blank to perform its operati'on,'ni'eans responsive to the resistance en'- counteredbetween saidtool and blank, said latter means including a cutout operable to interrupt further de'formation beyond apredetermined time interval, and means concurrently operable with said resistance responsive means for'in'terrupting f urther: tool. advancement and resulting deforma- 2.Ini'operating'mechanism for cutting machines, the combinationof pressure fluid operated means for advancing a tool toward -a blankand' nis lifted by ,t in uid ntil, it is arr-'75 into deforming engagement therewith, said means continuing to advance the tool into the blank to perform its operation, a conduit from said fluid operated means through which fluid may flow therefrom at an increased pressure during the tool advance into the blank, means operative. by the increased pressure including a cut-out operable to interrupt further deformation beyond a predetermined time interval, and means concurrently operable with said pressure operative means for interrupting further tool advancement and resulting deformation beyond a predetermined P int.

3. Ina machine for rolling threads in a blank, the combination of a pair of roller dies between which said blank is positioned, a fluid pressure operated device for advancing one of said dies toward the other and into deforming engagement with said blank, means-for relieving said fluid pressure when said first-named die has advanced a predetermined amount, and means controlled by said fluid pressure and concurrently operable with said first-named means for relieving said pressure after said first die has been advanced for a predetermined time interval.

4. In a machine for rolling threads in a blank, the combination of a pair of roller dies between which said blank is positioned, a fluid pressure operated device for advancing one'of said dies toward the other and into deforming engagement with said blank, means for supplying fluid pressure to said device, a three-way valve operable to alternately admit pressure through said supplying means to the device and to exhaust pres-.

sure from the device to the atmosphere, means for moving said valve to exhausting position when said first die has advanced a predetermined amount, and means controlled by said fluid pressure and concurrently operable with said lastnamed means for moving said valve to exhausting position after said flrst die has been advanced for a predetermined time interval.

5. In a machine for rolling threads in a blank, the combination of a pair'of roller dies between which said blank is positioned, a fluid pressure operated device for advancing one of said dies toward the other and into deforming engagement with said blank, means for supplying fluid pressure to said device, a three-way valve operable to alternately admit pressure through said supplying means to the device and to exhaust pressure from the device to the atmosphere, an electrical circuit, a switch in-said circuit closable by said fluid pressure when said first die has advanced a predetermined amount, a second electrical circuit, a second switch in said second circuit closable when said first die has advanced for a-predetermined time interval, and a solenoid common to both of said circuits for operating said valve.

6. In a machine for rolling threads in a blank,

. sure from the device to the atmosphere, an electrical circuit, a switch in said circuit closable by said fluid pressure when said first die has advanced for a predetermined time interval, and

a solenoid in said circuit operativel connected to said valve, whereby said valve will be moved to pressure exhausting position when said switch is closed.

'7. In combination with a screw thread rolling apparatus, means for classifying blank relative to a predetermined size while being threaded comprising a tool, means for advancing said tool toward the blank and into deforming engagement therewith, said means continuing to advance the tool into the blank to perform its operation, means responsiveto the resistance encountered between said tool and blank for interrupting further deformation when said blank is larger than the predetermined size, and means concurrently operable with said resistance responsive means and controlled by the advancement of said tool for interrupting further deformation when said blank is smaller than said predetermined size.

8, In operating mechanism for cutting machines, the combination of means for advancing a tool toward a blank and into deforming engagement therewith, said means continuing to advance the tool into the blank to perform its operation, time control means responsive to the resistance between said tool and blank, space control means responsive upon a predetermined tool advancement and concurrently operable with said time control means, and means common to bothsaid time and space control means for interrupting further deformation of said blank.

9. In operating mechanism for cutting machines, the combination of pressure fluid operated means for advancing a tool toward a blank and into deforming engagement therewith, said means continuing to advance the tool intothe blank to perform its operation, a conduit from said fluid operated means through which fluid may flow therefrom at an increased pressure during the tool advance into the blank, time control means responsive to the pressure in said conduit, space control means responsive upon a predetermined WILHELM WEMHONER. 

